"Clarity is the most important characteristic of good business writing, " says Mignon Fogarty, creator of the "Grammar Girl Quick and Dirty Tips for Better Writing" podcast.
The article also includes several quick and easy tips for defeating several security measures, none of which would be news to any actual terrorists, who are very likely capable of (for example) using Photoshop to make a boarding pass complete with the little squiggle on it.
Also worth looking at is a summary of industry best practices and tips for an inside sales rep or manager, as well as a quick overview on the processes related to Lead Management.